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Production process of white cerium oxide

A cerium oxide and white technology, applied in chemical instruments and methods, inorganic chemistry, rare earth metal compounds, etc., can solve the problems of insufficient color whiteness, easy sinking, unsatisfactory performance, etc., to achieve simple and easy process, high color pure white effect

Inactive Publication Date: 2007-06-27
北京方正稀土科技研究所有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is simple to produce, but the color whiteness of the product used in the ceramic industry is not enough, and the color is slightly yellow
If it is used on polishing powder, the effect is not very good, because fine polishing requires fine powder particle size, small specific gravity and easy suspension, and the product specific gravity of this method is about 7.1g / cm 3 , too heavy, easy to sink in the polishing solution, the performance is not satisfactory

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] CeCl coming out of the extraction tank 3 Add 0.5% NdCl to the total amount of rare earth in the feed solution 3 The solution, wherein the content of cerium oxide is 1.3 mol / L, and the pH of the solution is 2-3, is added with ammonium bicarbonate to precipitate cerium carbonate, washed and drained. Add cerium carbonate to an ammonium fluoride solution containing 5% F by mass, soak for 30 minutes, filter with suction until dry, and burn at 800°C for 2 hours. The color of the obtained product is pure white, the total amount of rare earth is 98%, and the average particle size D50 is 1.2 μm.

Embodiment 2

[0017] Same as the embodiment to CeCl 3 Add Nd to feed liquid 2 (SO) 3 After the solution, directly add hydrofluoric acid into the solution, the addition amount is F / REO=3%, add sodium bicarbonate to precipitate cerium carbonate, wash and spin dry. Burn at 800°C for 2 hours. The color of the obtained product is pure white, the total amount of rare earth is 96%, and the average particle size D50 is 1.0 μm.

Embodiment 3

[0019] Using conventional 4n cerium carbonate as a raw material, add cerium carbonate to an ammonium fluoride solution containing 2% F by mass, soak for 60 minutes, suction filter to dryness, and burn at 900°C for 2 hours. The obtained product is white in color, the total amount of rare earth is 98%, and the average particle size D50 is 2.0 μm.

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PUM

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Abstract

The present invention belongs to the field of wet metallurgy technology, and is especially production process of white cerium oxide. The key content of the present invention is to add fluorine into cerium oxide product to whiten and raise product hardness and life. Small amount of neodymia may be also added for further whitening. The production process includes the following steps: adding Nd in the amount of less than 1 % of REO into the cerium oxide material solution; depositing in ammonium or sodium bicarbonate solution, washing and drying; soaking the RE carbonate into solution containing F in 1-20 wt%; suction filtering and igniting to obtain white cerium oxide. The process is simple and feasible, and the product has whiteness higher than 90 %, granularity of about 1 micron and tap density 1-2 g / cu cm, and may be used in ceramic and polishing.

Description

technical field [0001] The invention belongs to the technical field of rare earth hydrometallurgy, and in particular relates to a production method of white cerium oxide. Background technique [0002] White cerium oxide is mainly used for decolorization and clarification of advanced optical glass, ceramics, glass polishing, etc. In the ceramic industry, it can be added to ceramic blanks as a warming agent. In the polishing industry, due to its hard and fine crystal grains, good crystal form and activity, fine and uniform particle size, and excellent polishing performance, it is also a high-grade polishing powder in polishing powder. Generally, the particle size D50~1-2μm is required, and the tap density is 1-2g / cm 3 , the color is pure white. [0003] White cerium oxide has been published in the following two production methods: [0004] 1) The foreign patent GB1490692 is cerium plus boron complex post-treatment, which is complicated to produce and rarely used. [0005]...

Claims

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Application Information

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IPC IPC(8): C01F17/00
Inventor 王嵩龄王爽贾江涛廖春生
Owner 北京方正稀土科技研究所有限公司
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